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/*
* This file is part of the coreboot project.
*
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <arch/io.h>
#include <soc/addressmap.h>
#include <soc/flow_ctrl.h>
#define FLOW_CTRL_HALT_CPU0_EVENTS 0x0
#define FLOW_CTRL_WAITEVENT (2 << 29)
#define FLOW_CTRL_WAIT_FOR_INTERRUPT (4 << 29)
#define FLOW_CTRL_HALT_LIC_IRQ (1 << 11)
#define FLOW_CTRL_HALT_LIC_FIQ (1 << 10)
#define FLOW_CTRL_CPU0_CSR 0x8
#define FLOW_CTRL_CSR_INTR_FLAG (1 << 15)
#define FLOW_CTRL_CSR_EVENT_FLAG (1 << 14)
#define FLOW_CTRL_CSR_WFI_CPU0 (1 << 8)
#define FLOW_CTRL_CSR_WFI_BITMAP (0xF << 8)
#define FLOW_CTRL_CSR_WFE_BITMAP (0xF << 4)
#define FLOW_CTRL_CSR_ENABLE (1 << 0)
#define FLOW_CTRL_HALT_CPU1_EVENTS 0x14
#define FLOW_CTRL_CPU1_CSR 0x18
#define HALT_REG_CORE0 (\
FLOW_CTRL_WAIT_FOR_INTERRUPT | \
FLOW_CTRL_HALT_LIC_IRQ | \
FLOW_CTRL_HALT_LIC_FIQ)
#define HALT_REG_CORE1 FLOW_CTRL_WAITEVENT
static void *tegra_flowctrl_base = (void*)TEGRA_FLOW_BASE;
static const uint8_t flowctrl_offset_halt_cpu[] = {
FLOW_CTRL_HALT_CPU0_EVENTS,
FLOW_CTRL_HALT_CPU1_EVENTS
};
static const uint8_t flowctrl_offset_cpu_csr[] = {
FLOW_CTRL_CPU0_CSR,
FLOW_CTRL_CPU1_CSR
};
static uint32_t flowctrl_read_cpu_csr(int cpu)
{
return read32(tegra_flowctrl_base + flowctrl_offset_cpu_csr[cpu]);
}
static void flowctrl_write_cpu_csr(int cpu, uint32_t val)
{
write32(tegra_flowctrl_base + flowctrl_offset_cpu_csr[cpu], val);
val = read32(tegra_flowctrl_base + flowctrl_offset_cpu_csr[cpu]);
}
void flowctrl_write_cpu_halt(int cpu, uint32_t val)
{
write32(tegra_flowctrl_base + flowctrl_offset_halt_cpu[cpu], val);
val = read32(tegra_flowctrl_base + flowctrl_offset_halt_cpu[cpu]);
}
static void flowctrl_prepare_cpu_off(int cpu)
{
uint32_t reg;
reg = flowctrl_read_cpu_csr(cpu);
reg &= ~FLOW_CTRL_CSR_WFE_BITMAP; /* clear wfe bitmap */
reg &= ~FLOW_CTRL_CSR_WFI_BITMAP; /* clear wfi bitmap */
reg |= FLOW_CTRL_CSR_INTR_FLAG; /* clear intr flag */
reg |= FLOW_CTRL_CSR_EVENT_FLAG; /* clear event flag */
reg |= FLOW_CTRL_CSR_WFI_CPU0 << cpu; /* power gating on wfi */
reg |= FLOW_CTRL_CSR_ENABLE; /* enable power gating */
flowctrl_write_cpu_csr(cpu, reg);
}
void flowctrl_cpu_off(int cpu)
{
uint32_t reg;
reg = cpu ? HALT_REG_CORE1 : HALT_REG_CORE0;
flowctrl_prepare_cpu_off(cpu);
flowctrl_write_cpu_halt(cpu, reg);
}
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